ΛCDM and the distribution of dark matter in galaxies: A constant–density halo around DDO 47
- Creators
- Salucci, P.
- Walter, F.
- Borriello, A.
Abstract
In this paper we present a test case for the existence of a core in the density distribution of dark halos around galaxies. DDO 47 has a rotation curve that increases linearly from the first data point, at 300 pc, up to the last one, at 5 kpc. This profile implies the presence of a (dark) halo with an (approximately) constant density over the region mapped by data. This evidences the inability of standard Λ Cold Dark Matter scenario to account for the dark matter distribution around galaxies, and points toward the existence of an intriguing halo scale–length of homogeneity. This work adds up to the results of Blais-Ouellette et al. (2002), Trott & Webster (2002), Binney & Evans (2002), de Blok & Bosma (2002) and Bottema (2002) in suggesting that at galactic scales CDM theory should incorporate, as an intrinsic property, a "density core" feature.
Additional Information
© 2003 ESO. Received: 3 September 2002. Accepted: 10 April 2003. We want to thank the referee R. Bottema for suggestions that have improved the presentation of this paper. P.S. wants to thank G. Danese and U. Klein for useful discussions.Attached Files
Published - aa3059.pdf
Submitted - 0206304.pdf
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Additional details
- Eprint ID
- 85006
- Resolver ID
- CaltechAUTHORS:20180228-104237796
- Created
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2018-02-28Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field